If I did not explicitly enable Data Protection entitlement in my iOS app, are all stored data / files still encrypted automatically since iOS 7? The iOS Security guide (https://www.apple.com/business/docs/iOS_Security_Guide.pdf) seems to imply that with the following statement:
In addition to the hardware encryption features built into iOS devices, Apple uses a technology called Data Protection to further protect data stored in flash memory on the device. Data Protection allows the device to respond to common events such as incoming phone calls, but also enables a high level of encryption for user data. Key system apps, such as Messages, Mail, Calendar, Contacts, Photos, and Health data values use Data Protection by default, and third-party apps installed on iOS 7 or later receive this protection automatically.